3228 LESによるディーゼル噴霧の不均一構造の数値解析(S48-2 燃料噴霧・混合気形成(2),S48 燃料噴霧・混合気形成)

概要

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Diesel spray simulation using Large Eddy Simulation (LES) is performed. The process of diesel spray is highly unsteady involving atomization of droplets, droplet vaporization, and interactions with the turbulent flow field. Although the majority of the past numerical studies about diesel spray have employed RANS approach, it is can't express turbulent flow field accurately. The interaction between fuel droplets and turbulent flow field play an important role of diesel spray mixture. In this study, the LES version of the KIVA code (KIVALES) is used as calculation code. Non-evaporating spray and evaporating spray are calculated, and then computational results of KIVALES are compared with ones using KIVA3V res.2 code (RANS approach). In the case of non-evaporating spray, KIVALES is able to resolve vortex structure in vapor phase. Fuel droplets are classified by the vortex and heterogeneous structure of diesel spray (branch like structure) is observed in the KIVALES.
一般社団法人日本機械学会の論文
2005-09-18